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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
      const arr = [];

      printNum(2); // [1,3,5,7,9,2,6,4,8]
    </script>
  </body>
</html>
